/Engine/Source/Runtime/Core/Public/Experimental/ConcurrentLinearAllocator.h
Indicates whether memory is acquired from the same source as used byFMalloci.e. FMemory/FPlatformMemory::BaseAllocator(). It's needed so that ConcurrentLinearAllocator could correctly account for this memory in the memory stats and tracking systems. It is 'true' by default, which is suitable for most implementations. However, if you create a custom allocator that acquires memory in a different way e.g. directly from the OS usingFPlatformMemory::BinnedAllocFromOS, then you should set this variable to 'false'.
static constexpr bool UsesFMalloc = true;